Disclosed examples include methods, computer readable mediums and motor drive power conversion systems for sensorless speed control of a motor driven by an inverter through an intervening filter, a transformer and a motor cable, in which sensorless vector control is used to regulate the motor speed
Disclosed examples include methods, computer readable mediums and motor drive power conversion systems for sensorless speed control of a motor driven by an inverter through an intervening filter, a transformer and a motor cable, in which sensorless vector control is used to regulate the motor speed based on a speed feedback value computed according to voltage or current values associated with the motor drive using an observer having formulas and impedance parameters of the filter, the transformer, the motor cable and the motor.
대표청구항▼
1. A power conversion system, comprising: an inverter comprising a DC input, an AC output, and a plurality of switching devices coupled between the DC input and the AC output and operative according to inverter switching control signals to convert DC electrical power received at the DC input to prov
1. A power conversion system, comprising: an inverter comprising a DC input, an AC output, and a plurality of switching devices coupled between the DC input and the AC output and operative according to inverter switching control signals to convert DC electrical power received at the DC input to provide AC electrical output power at the AC output to drive a motor through an intervening filter, a transformer and a motor cable; anda controller configured to compute a speed feedback value representing a rotational speed of the motor according to at least one voltage or current value associated with the power conversion system, and to provide the inverter switching control signals to control the inverter to regulate the rotational speed of the motor at least partially according to the inverter speed feedback value using vector control;wherein the controller is configured to compute the speed feedback value according to the at least one voltage or current value associated with the power conversion system using an observer that includes impedance parameters of the filter, the transformer, the motor cable and the motor. 2. The power conversion system of claim 1, wherein the controller is configured to compute the speed feedback value by: computing an estimated motor position value, representing an angular position associated with the motor load according to the at least one voltage or current value associated with the power conversion system using a position observer that includes impedance parameters of the filter, the transformer, the motor cable and the motor; andcomputing the speed feedback value according to the estimated motor position value. 3. The power conversion system of claim 2, wherein the controller is configured to compute the estimated motor position value using the following equation: θ=tan-1(λβ′λα′);wherein: [λα′λβ′]=[-iα·Lsys-iβ·Lsys]+∫[vα-iα·Rsysvβ-iβ·Rsys]·ⅆt;wherein: Rsys=Rmotor′+Rcable′+Rfilter+RXmfr′=(NpNs)2·Rmotor+(NpNs)2·Rcable+Rfilter+[RXmfr_p+(NpNs)2·RXmfr_s];wherein: Lsys=Lmotor′+Lcable′+Lfilter+LXmfr′=(NpNs)2·Lmotor+(NpNs)2·Lcable+Lfilter+[LXmfr_p+(NpNs)2·LXmfr_s′];wherein Rsys is a resistance of the filter, the transformer, the motor cable and the motor referred to the primary side of the transformer, R′ motor is a resistance of the motor referred to the primary side of the transformer, R′cable is a resistance of the motor cable referred to the primary side of the transformer, Rfilter is a resistance of the filter referred to the primary side of the transformer, R′xfmr is a resistance of the transformer referred to the primary side of the transformer, and Np/Ns is a turns ratio of the transformer; andwherein Lsys is an inductance of the filter, the transformer, the motor cable and the motor referred to the primary side of the transformer, L′ motor is an inductance of the motor referred to the primary side of the transformer, L′ cable is an inductance of the motor cable referred to the primary side of the transformer, Lfilter is an inductance of the filter referred to the primary side of the transformer, and L′xfmr is an inductance of the transformer referred to the primary side of the transformer. 4. The power conversion system of claim 2, wherein the observer includes resistance and inductance parameters of the filter, the transformer, the motor cable and the motor; and wherein the observer includes a turns ratio parameter of the transformer. 5. The power conversion system of claim 1, wherein the at least one voltage or current value associated with the power conversion system is measured at an output of the inverter. 6. The power conversion system of claim 1, wherein the at least one voltage or current value associated with the power conversion system is at least one of a command value and a reference value computed for a control loop used to regulate an operating parameter of the motor. 7. The power conversion system of claim 1, wherein the at least one voltage or current value associated with the power conversion system is measured at an output of the filter. 8. The power conversion system of claim 1, wherein the at least one voltage or current value associated with the power conversion system is measured at an output of the transformer. 9. The power conversion system of claim 1, wherein the controller is configured to provide the inverter switching control signals to regulate the rotational speed of the motor using vector control via a speed control loop and a current control loop. 10. A method for sensorless speed control of a motor driven by an inverter through an intervening filter, a transformer and a motor cable, the method comprising: using at least one processor, computing a speed feedback value representing a rotational speed of the motor according to at least one voltage or current value associated with the power conversion system using an observer that includes impedance parameters of the filter, the transformer, the motor cable and the motor; andusing the at least one processor, providing inverter switching control signals to control an inverter to regulate the rotational speed of the motor at least partially according to the inverter speed feedback value using vector control. 11. The method of claim 10, wherein the at least one processor is configured to compute the speed feedback value by: computing an estimated motor position value, representing an angular position associated with the motor load according to the at least one voltage or current value associated with the power conversion system using a position observer that includes impedance parameters of the filter, the transformer, the motor cable and the motor; andcomputing the speed feedback value according to the estimated motor position value. 12. The method of claim 10, comprising measuring the at least one voltage or current value at an output of the inverter. 13. The method of claim 10, comprising: using the at least one processor, computing the at least one voltage or current value as at least one of a command value and a reference value for a control loop used to regulate an operating parameter of the motor. 14. The method of claim 10, comprising measuring the at least one voltage or current value at an output of the filter. 15. The method of claim 10, comprising measuring the at least one voltage or current value at an output of the transformer. 16. A non-transitory computer readable medium, comprising computer readable instructions which, when executed by at least one processor cause the at least one processor to implement a process including: computing a speed feedback value representing a rotational speed of a controlled motor according to at least one voltage or current value associated with a power conversion system using an observer that includes impedance parameters of the filter, the transformer, the motor cable and the motor; andproviding inverter switching control signals to control an inverter of the power conversion system to regulate the rotational speed of the controlled motor at least partially according to the inverter speed feedback value using vector control.
Narazaki Kazushige,JPX ; Iijima Tomokuni,JPX ; Tazawa Toru,JPX ; Doyama Yoshiaki,JPX ; Maruyama Yukinori,JPX, Control apparatus for motor, and motor unit having the control apparatus.
Nagate Takashi (Suwa JPX) Uetake Akihito (Suwa JPX) Koike Yoshikazu (Suwa JPX) Tabata Kunio (Suwa JPX), Controller for brushless DC motor without position sensor.
Konecny Karl Frank ; Plunkett Allan Barr ; Packard Kelly Ray ; Akerson Jacqueline Rae, Downhole pumping system with variable speed pulse-width modulated inverter coupled to electrical motor via non-gap tran.
Skibinski, Gary L.; Wilkins, John; Hoadley, Rick; Guskov, Nick; Braun, Dennis, Integrated power conditioning system and housing for delivering operational power to a motor.
Anwar, Mohammad N.; Schulz, Steven E.; Green, Stephan N.; Tarchinski, James E., Method and apparatus for avoiding electrical resonance in a vehicle having a shared high-voltage bus.
Royak, Semyon; Breitzmann, Robert J.; Harbaugh, Mark M., Method and apparatus for phase current balance in active converter with unbalanced AC line voltage source.
Lee,Kevin; Ahlgren,Jyrki K.; Wallace,Ian T.; Doring,Thomas M., System and method of controlling the start-up of an adjustable speed motor drive based sinusoidal output power conditioner.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.